cgswss,
I have the same darn problem as you do. I use 3 different computers/laptops and different modems with Futura software with different modem strings from three different location.
Everything was working fine in mid December, come January the old/new reliable modem no longer works with relay or tty. After 15 years?! Yes, I am be in Michigan for the last 13 years. It is not just you.
I have been working with AT&T relay and we can't get it to work with different software in the last three weeks. Seems to have a disconnect on the modem handshake after 24 seconds, I get hangup from relay and tty now.. Changing the modem strings to allow the handshaking longer, doesn't help. I'll get maybe 1 call connect out of 100 a day!
I gave up. I am looking into captel phones, mobile captel phones, webcaptel, exploring reliable IM services that allows me to provide professional engineering service to my customer and suppliers. Currently, I am waiting on captel phones to try out.
Then most conviencent cell with the captel application installed on it.
It doesn't solve your problem, how do you talk to your brother? Back to the old tty phone system? I haven't tried it to see if they still work. Makes me wonder if the 4G network caused all this, someone change their phone servers settings, or went pure baudot...because ASCII doesn't work any more.
It's up to you how much effort & money you want to put into it. I am going involunteerily into latest technology gimzos capabilities unlike you I am deaf/HOH and everyone else audible.
Hope this help you.